Implement `expect().toBeEmpty()` (#3060)

* Implement `expect().toBeEmpty()`

* Fix formatting on test

* Finish up expect().toBeEmpty()

* Update expect.test.ts

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/bun.js/bindings/ZigGeneratedClasses.cpp b/src/bun.js/bindings/ZigGeneratedClasses.cpp
index d338bcb9c..5482c461f 100644
--- a/src/bun.js/bindings/ZigGeneratedClasses.cpp
+++ b/src/bun.js/bindings/ZigGeneratedClasses.cpp
@@ -2671,6 +2671,9 @@ JSC_DECLARE_HOST_FUNCTION(ExpectPrototype__toBeCloseToCallback);
 extern "C" EncodedJSValue ExpectPrototype__toBeDefined(void* ptr, JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame);
 JSC_DECLARE_HOST_FUNCTION(ExpectPrototype__toBeDefinedCallback);
 
+extern "C" EncodedJSValue ExpectPrototype__toBeEmpty(void* ptr, JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame);
+JSC_DECLARE_HOST_FUNCTION(ExpectPrototype__toBeEmptyCallback);
+
 extern "C" EncodedJSValue ExpectPrototype__toBeEven(void* ptr, JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame);
 JSC_DECLARE_HOST_FUNCTION(ExpectPrototype__toBeEvenCallback);
 
@@ -2779,6 +2782,7 @@ static const HashTableValue JSExpectPrototypeTableValues[] = {
     { "toBe"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeCallback, 1 } },
     { "toBeCloseTo"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeCloseToCallback, 1 } },
     { "toBeDefined"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeDefinedCallback, 0 } },
+    { "toBeEmpty"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeEmptyCallback, 0 } },
     { "toBeEven"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeEvenCallback, 0 } },
     { "toBeFalsy"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeFalsyCallback, 0 } },
     { "toBeGreaterThan"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::NativeFunctionType, ExpectPrototype__toBeGreaterThanCallback, 1 } },
@@ -2945,6 +2949,33 @@ JSC_DEFINE_HOST_FUNCTION(ExpectPrototype__toBeDefinedCallback, (JSGlobalObject *
     return ExpectPrototype__toBeDefined(thisObject->wrapped(), lexicalGlobalObject, callFrame);
 }
 
+JSC_DEFINE_HOST_FUNCTION(ExpectPrototype__toBeEmptyCallback, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    auto& vm = lexicalGlobalObject->vm();
+
+    JSExpect* thisObject = jsDynamicCast<JSExpect*>(callFrame->thisValue());
+
+    if (UNLIKELY(!thisObject)) {
+        auto throwScope = DECLARE_THROW_SCOPE(vm);
+        return throwVMTypeError(lexicalGlobalObject, throwScope);
+    }
+
+    JSC::EnsureStillAliveScope thisArg = JSC::EnsureStillAliveScope(thisObject);
+
+#ifdef BUN_DEBUG
+    /** View the file name of the JS file that called this function
+     * from a debugger */
+    SourceOrigin sourceOrigin = callFrame->callerSourceOrigin(vm);
+    const char* fileName = sourceOrigin.string().utf8().data();
+    static const char* lastFileName = nullptr;
+    if (lastFileName != fileName) {
+        lastFileName = fileName;
+    }
+#endif
+
+    return ExpectPrototype__toBeEmpty(thisObject->wrapped(), lexicalGlobalObject, callFrame);
+}
+
 JSC_DEFINE_HOST_FUNCTION(ExpectPrototype__toBeEvenCallback, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
 {
     auto& vm = lexicalGlobalObject->vm();